Rock-drill.



G. W. sMlTH. ROCK DRILL.

APPLICATION FILED MAR. 4, 1912A Patented Gat. 21, 1913.

2 SHEETS-SHEET Z.

GRANT W. SMITH, OF CHATTANOOGA, TENNESSEE.

ROCK-DRILL.

Specification of Letters Patent.

Patented Oct. 2 L1913.

Application led March 4, 1912. Serial No. 681,537.

To' all lwhom, 15 may concern Be it known that I, GRANT W. SMITH, residing at Chattanooga, in the county of Hamilton and State of Tennessee, have invented new and useful Improvements in Rock-Drills, of which the following is a.

specification- Myv invent-ion relates to certain new and luseful improvements in rock drills of the reciprocating hammer piston type. 'In

quently made to accomplish this act by forcing the compressed air, water or other fluid intoj the hole (usually through the drill) while the drilling operation is taking place.

One of the objects of my invention, therefore, is to providea drilling engine in which adequate provision i'smade for sealing the li drill the chuck end of the machine and? maintaining'the joints of the' machine tight to prevent leakage andconsequent waste of thefluid used to blow out/ the dirt.

Y Another object of lsimplify and reduce thec'ost of production and maintenance of the drillin engine, and to so design and construct a evice of this character that should' one or-more of the parts thereof .become worn ror broken the same may be replaced with little or no effort or delay. v

A further object of the invention' is to provide means for sealing the tappet plug in its bearing to prevent leakageV of fluid around the same when the parts are in operation.

-More specilically, the invention, in addition to providing means for .accomplishing rthe foregoing objects also includes those novel details of construction, combination and arrangement of parts, all of which `will be first fully described and then be specifically pointed out in the appended claims, reference being had to the accompanying drawings, in which:-

. Figure 1 is av central, vertical, longitudinal section of the. complete drilling mechanism. `Fig. 2 is ,a full size detail vertical i longitudinalsection ofa portion of the drilling 'engine showingthose -parts which' principally constitute `the 4present invention.

he invention is to- Figs. 3 and 4: are cross sections on the lines 3 3 and 4 4: respectively of Fig. 2, looking in the direction of the arrows. Fig. 5 is a cross section on the line 5-5 of Fig. 1, and Fig. 6 is a front elevation of the drilling engine.

In the drawings in which like numerals and letters of reference designate like parts in all the figures, 1 is the barrel of the drill, the front end of which is longitudinally slotted, as at 2, and circumferentially grooved, as at 3. 4 is a clamp which sets in the groove 3, and is adapted to force the slotted or split end of the barrel 1, to grip the end. plug 5, which is threaded into the slotted end of thebarrel 1, and ccperating with the sealing plug 7, acts as the chuck for receiving the drill 57, as indicated in dotted lines in Figs. 1.and 2. l

The plug 5 is rigidly held in place through the action of the clamp a, so as to prevent turning of the same, and it is provided with a hexagonal bore 6, to receive the.

correspondingly shapeddrill 57.

The plug 7, which for convenience I term the-sealing plug, has a bore 10 correspondand at its outer end it has a counter bore l2, with. which one or more approximately radial bores 13, communicate. The bore 12 forms a pocket to receive the sealing washer 14 and ysustaining ring 16.

The washer 14: is preferably 4constructed of leather or other suitable mater'ipl, and formed as best indicated in Fig. 2i`of' the drawings, the same having a passage 15 of corresponding form, and forming a continuation of the passage 6, the passage 15 being located between'the passages G and 10. In practice, the washer -14 will swell at 17, into the bores 13, so as to hold the washer lil-y y from turning and thereby maintain the hexagonal passage 15 in alinement with the correspondingly shaped passages 6 and 10.

In order to hold the plugs 5 and 7 from same of two diameters, the larger portion of the bore forming the tappet head chamber 20, and the narrower portion 24 thereof, serving to permit the projectioi'i of the shank of the tapget, and also sewing to receive the tappet sealing washer 35, wir :h is secured between the plugs 1,9 and 30, and it rests in the counter bore 85, of the tappet bearing plug 80. Tvllhcre they abut, the plugs 19 and 3() are beveled off at 21 and 34 to form a V-shaped annular chamber within the barrel 1. The washer receiving entrance portion of the plug 19 is rounded, as at 22, and it will be observed bw; by ref erence to'hig. 2, the washer 35 d not en tend the full length of the here of the plug 19, but is so designed as to leave a space 25 aro-und the tappet 26. The space maintained in communication with the J- shaped annular chamber 59 between the plugs 19 and 80, by bores 28 in the plug 19, while the tappet 26 is provided with bores 29 in its head 27, that effect connnunication between the space 25 and the axial recess 28 of the tapp'et 26, which communicates with the longitudinal hole or bore 58 of the drill 57.

The bearing plug 30 is bored at 31 to snugly receive the shank of the tappet 26 to form a bearing for the same, it being understood that the enlarged bore, forming the chamber 20, ofthe plug 19, serves as a bearing for the tappet head 27. The bearing plug 30 has a circumferential annular groove 32 that communicates with the V- shaped annular chamber 59, through the .medium of the longitudinal. grooves 33.

Achamber 41 hereinafter again referred to.

The sleeve 40 and the barrel 1 are provided with an exhaust port 42 that delivers into the exhaust nipple`56, see Figs. 2 and 5,. The sleeve v40 is also provided with an outer longitudinal groove 44 for conveying air or -other scavenging fluid to the internal annular groove G0 of the barrel 1, from which the air passes into the groove 32, and through the grooves into the chamber 59 from whence 'it is conducted through the ports 23, 29 and 28 into the drill bore 58.

46 is the hammer 'pistonbearing sleeve which is keyed at 45to the sleeve 40 and which containsthe usual bores and grooves for coperating with the hammer piston 50. f 49 is the working agent inlet nipple which delivers into the annular groove 47 of the barrel 1, that in turn communicates with the interior of the sleeve 46 to act on the not/aars hammer piston 50, and the sleeve 46 has an outer longitudinal groove portion 48 for effecting connnunication between the groove 47 and the groove 44, whereby the working agent is ceinlueted to the groove 44. As the construe-tim of the hannner piston 50 and its sleeve 47 forms, per se, no part of the present invention, but is of the ordinary construction, a detail description thereof is thought. toibo' imnecessary.

51 is the closure plug for the rearend of the barrel 1, and 52 is the handle socket member into which the barrel 1, projects.

is the recoil spring,.and 55 is the hand grip portion of the handle member.

58 is the bolt which secures the plug 51 to the barrel l and holds the handle in place. The construction of. the handle mechanism also forms no part of the present invention and a further detail descriptien thereof is thought to be unnecessary.

.ln the practical operation of the invention, the drill 57 is inserted as indicated in dotted lines in Figs. 1 and 2 until the end of the drill engages the head 27 of the tappet 2G. lVorking agent is then admitted into the groove 47 through the nipple 49 and the pistonk'O is causedto reciprocate. lfiorking agent also passes .from the groove 47 via the grooves 48, 44,;60, 32, 33, 59, and the bores 28, l29, and 28, intothe bore 58, of the drill by which it isconducted to the cut to blow out the` debris.

Vlhen the parts are in operation, the live air in the space 25 will assist in holding the packing or washer 36 in tight Contact with the tappet 26 and thereby prevent leakage of the air into the exhaust chamber 41, and should any air pass around the inner end of the drill 57 through the bore l0, it Will enter the packing chamber 12 and assist in forcing the packing 14 in tight contact with the drill, and thereby prevent the escape of air around the drill throughthe passage 6, in the plug 5. Any air that would leak between the plugs 7 and 19 andv attempt to pass through the barrel 1 to the outer end, will be checked by the packing 9 and similarly the packing 39 will preventfthe 'leakage of the air between the groove 60 and the interior of the exhaust chamber 41.

. From the foregoing description, taken in conrnction With the accompanying drawings, it isthought the complete construc-` tion, operation and advantages of the invention will be apparent to those skilled in the art, and l desire to say, I do not wish to be limited to the specific details of construction shown and described, as it is obvious that numerous changes may be made in the details of construct-ion and arrangement of parts without departing from the spirit of the invention, and furthermore with little or no change' the machine may be made to operate, not only with compressed are Lorenzi@ ing means to leave fluid receiving pockets' to receive the leaking fluid under pressure and thereby press said packing into tight sealing contact with the drill.

2. In a drilling apparatus, a barrel, a hammer piston sleeve and a hammer piston Within said barrel, means for leading working fluid to said sleeve and piston te reciprocate said piston; said barrel having an ex-Y haust chamber andan exhaust port coinmunicating with the exhaust chamber, a tappet carrier forming a partition in said barrel to close the front end of said exhaust chamber, a tappet-carried by said carrier and projecting into said exhaust chamber, a drill chuck in said barrel, said tappet having a bore to deliver into the drill and meansfor delivering iluid under pressure to said tappetL bore.

3. In a drilling apparat-us, a bai-reha lia-miner piston sleeve and a hammer piston within said barrel, means for leading working luid to said sleeve and piston to reciprocate said piston; said barrel having an exhaust chamber and 'an exhaust port communicating with the exhaust chamber, a tappet carrier forming a partition in said barrel to close the front end of said exhaust chamber, a tappet carried by said carrier and projecting inte said exhaust chamber, a drill chuck in said barrel, said tappet having a bore to deliver into the drill and means for deliverina` liuid under pressure to said tappet bore,

and means for sealing ott the escape of fluid around said tappet between said tappet bore and the exhaust chamber. 4. In a drilling apparatus, a barrel, ahammer piston sleeve and a hammer piston with- .in said barrel, means for leading working iiuid to said'sleeve and piston to reciprocate said piston; said barrel having an exhaust chamber and an exhaust port communicating with the exhaust chamber, a tappet carrier forming a partition in said barrel to close the front end of said exhaust chamber, a tappet carried by said carrier and projecting` into said exhaust chamber, a drill chuck in said barrel, said tappet having a bore to del'ver into the drill and means for delivering fluid under pressure to said tappet bore, and means for sealing oil the esca-pe of .liuid around said tappet between said tappet bore and the exhaust chamber, land means for sealing ofi the escapey of .fl-uidl through said chuck around said drill;

5. In a drilling apparatus, a barrel, ahammer piston sleeve and a hammer piston within said barrel, means for leading Working ifluid to said sleeve and piston to reciprocate said piston; said barrel having an exhaust:

chamber` and an exhaust port communicating with the exhaust chamber, a t-appct carrier forming a partition in said barrel to close the front end of said exhaust chamber, a tappet carried by said carrier and -projecting into said exhaust chamber, a drill chuck in said barrel, said tappet having a bore to deliver into the drill and means for delivering fluid under pressure to said tapet bore and means for sealin0r oil' iuid 7 1! through said chuck 'around said drill.

G. ln a drilling apparatus, a barrel, a hainmer piston sleeve and a hammer piston within said barrel, means Jfor leading working fluid to said sleeve and piston to reciprocate said piston:l said barrel having an exhaust chamber and an exhaust port communicating with the exhaust chamber, a tappet carrier forming a partition'in `said barrel to close the front end et said exhaust chamber, a. tappet carried by said carrier and projecting into said exhaust chamber, a drill chuck in said bairel, saidntappet having a bore to deliver into the drill and means ordelivering fluid under pressure to said tappet bore, and means for sealing oil the escape of fluid around said tappet between said. tappet bore and the exhaust chamber, said last named means including a packing carried by saidl carrier and located between said exhaust chamber and the place of fluid delivery into said tappet bore whereby the fluid under pressure will hold the packing in sealing contact with said tappet.

7 In a drillingapparatus, a barrel, a hammer piston operating in said barrel, means for delivering working iuid to said hammer piston, said barrel including,V an exhaust chamber, a tappet carrier mounted in ,said

Iico

barrel in front of said exhaust chamber, a

tappet operating in said carrier andentering into said. exhaust chamber, said Vtappet carrier comprising two members, said tappethaving a head and a shank, one of said members having a bore to receive said shanky.

and the other member having abore i e. ceive said head and permit passage o'l, said shank, said other member bore beingitef greater diameter than the tappet shank,

a packing supported by said members and,l

shank between said packing and said; tappetil r head to hold said packing in tight engagement with said tappet shank.

lib

barrel in :frentof sai` exhaust chamber, a

tappet operaiingin said carri and entering into said e' uaust chamber, saai carrier compriein tivo members, having a head ...nd a shari* members having a here to rc said shank and the other member .bai ,A a bore to receive said head and permit passage or said shank, said other member bore being of greater diameter flic tappet shank, a packing suppe id members and pro jecting into sam other member shank bore to encircle said tappet shank, and means for delivering iiuid under pressure into said other member bore around said shank between said packing and` said tappet head to hold said pack in tight engagement with said tappe"- id tappet having passages commani A member bore to deliiff r the ruid under pres-- sure to the drill, and a drill chuck carried by said barrel for holding the drill in aiinement with said ,tappetn 9. In a drilling apparatus, a barrel, a drill chuck held in said barrel and cons1sting of tivo plug like members, one oi said members forming an outer closure plug for said barrel, 4means Afor securing said outer closure plug rigidly in position in said barrel, said chuck members havinga drill passage through the same, one or" said chuck members having a chamber' in communication with said drillapassage, a packing medium 1n said chamber i'or sealing oil' the tappet d tappet one ci.I said escape of fluid around said drill, means ior.

sure from Vsaid tappet' chamber into said piston opto exhaust means for in exhaust'chamtler, and a hammer eratively mounted in said barrel into said exhaust chamber, and delivering Working' fluid to said piston operate the saine.

10. in a drilling apparatus, a barrel, a d fill holding chuck mounted in said barrel and including tivo members being freely fitted into th barrel, and having an annular packing ring to prevent leakage between the same and rae bar- ,ating i uib said other members, one of inraaae rel, means :in said barrel forming a stop against which said packing ring carrying member rests, the other chuck member comprising a body threaded and clamp-ed into the barrel to abut the first mentioned chuck member, each of said chuck members having a hexagonal drill receiving bore, one of said chuck members having an annular counterbore at one end, a packing member of U- shape in cross section iittcd into said c0un terbore, one part of said packing member being annular to lie against the annular wall of said counterbore, and the other part of said packing member being hexagonal to fitthe drill, substantially as shown and de scribed.

ll. In a drilling apparatus, a barrel, a drill holding chuck mounted in said barrel and including tivo members, one of lsaid members beingfreelv litted into the barrel, and having an annular packing ring to prevent leakage between the same and the barrel, means in said barrel forming a stop against which said packing ring carrying member rests, the other chuck member comprising a body threaded and clamped into the barrel to abut the iirst mentioned chuck member, each of said chuck members having a hexagonal drill receiving bore, one of said chuck members having an annular coui'iterbore at one end, a packing member of U-shape in cross section litted into said counterbore, one part of said packing member being annular to lie against the annular Wall of said counterborc, and the other part of said packing member being hexagonal to lit the drill, sail counterbored chuck member having indentations merging With the counterbore into which said packing member is adapted to swell and form retaining knobs to prevent turning "of the packing membery in the counterbore.

l2. In a drilling apparatus, a barrel, a drill holding chuck mounted in said barrel and including tivo members, one of said members being freely fitted into the barrel, and having an annular packing ring to prevent leakage between the same and the barrel, means in said barrel forming a stop against which said packing ring carrying membeigrests, the other chuck member comprising a body threaded and clamped into the barrel to abut the first mentioned chuck lmember, each of said chuck members having a hexagonal drill. receiving bore, one of said chuck members having an annular counterbore at one end, a' packing member of U- shape in cross section fitted into said counterbore, one part of said ,packing member being annular to lie against the annular Wall of said counterbore, ,and the other part of v said packing member being hexagonal to fit the drill, said counterbored chuck member having indentations merging with the counterbore into which said packing member is adapted to swell and form retaining knobs to prevent turning of the packing member in the Counterbore, and an annular retaining .ring helcl Within said packing member, the internal surface of said ring coperat- With the hexagonal portion of said packing member "to form Huid pockets into which the leaking fluid is adapted to pass to prees the hexagonal portion of said packing mem-A ber intotight Sealing Contact witlithe drill. 10

- GRANT W. SMITH.

lVit-nesses:

PAUL CAMPBELL, CHAS. S. COFFEY. 

